Straight-way valve



K m M R 0 "AW. M W R Straight-Way Valve.

No. 225,229. Patented Mar. 9, 1880'.

UNITED STATES PATENT OFFICE.

EDWARD W. MCCORMICK, OF BRIDGEPORT, CONNECTICUT.

STRAIGHT-WAY VALVE.

SPECIFICATION forming part of Letters Patent No. 225,229, dated March 9, 1880.

Application filed January 8, 1880.

To all whom it may concern:

Be it known that I, EDWARD W. MCCOR- MICK, of Bridgeport, Connecticut, have invented certain Improvements in Straight-Way Valves, of which the following is a specification.

My improvements relate to devices for operating straight-way valves; and my invention consists in the combination, with a screw-valve stem, of two valve-disks united by a togglejoint to a swivel inserted into the lower end of the valve-stem, by the operation of which the toggle-joint is extended or bent, and the valve- (lisks thrust outwardly against the annular valve-seats on opposite sides of the valve chamber, or withdrawn therefrom,as the case may be, preparatory to being lifted by the continued rotation of the valve-stem.

In the accompanying drawings, representing a straight-way valve embodying my invention, Figure l is a side elevation of the valve, with a portion of the wall of the valve-chamber removed, for the purpose of exhibiting the valve-disks and the devices by which they are operated. Fig. 2 is a transverse section of the valve-chamber through the line an ac on Fig. l.

The drawings represent an ordinary straightway valve, A, the valve-chamber a of which is provided upon its opposite sides with two annular valve-seats, a and a Two valve-disks, B and b, are forced outwardly, and hence against the valve-seats a and a, respectively, by means of a togglejoint which unites them, and which is com- I posed of the levers C and c, which are, respectively, pivoted at one end to the valve-disks, and at the other to a swivel, D, axially inserted in the lower end of the screw-stem E, and keyed therein by the screw e, which is inserted laterall y through the lower part of the valve-stem, and atitsinner end engages the annular groove (1, formed in that part of the periphery of the swivel D which is inserted in the lower end of the screw-stem.

The valve chamber is surmounted by the usual cap A, through which the screw-stem passes, and the valve is opened by unscrewing the valve-stem, which bends the toggle-joint and withdraws and lifts both of the va-lvedisks away from their seats, while the contrary motion of the valve-stem serves to lower the valvedisks and extend the togglejoint, and thus thrust the valve-disks outwardly against their seats and close the valve-openin' g.

The area of the opening in the top of the valve-chamber is such that when the cap is removed the screw-stem and the valve-disks attached thereto by thetoggle-joint may be easily removed.

It will, of course, be seen that each valvedisk, when resting upon its seat, serves as the abutment for the support of the toggle in delivering its thrust upon the valve-disk.

I claim as my invention in a straight-way valve- The combination of the screw-stem E with the swivel D and toggle-levers C c, the free ends of which are, respectively, pivoted to two valve-disks, each provided with an annular valve seat, substantially as shown and described.

EDWARD W. MCCORMICK.

Witnesses:

I. L. MOREHOUSE, 0. H. A. BROTHWELL. 

